\documentclass[a4paper]{book}
%\pagestyle{page}
\usepackage{graphicx}
\usepackage{html}
\usepackage{ifpdf}
\usepackage{fancyhdr}
\usepackage[utf8]{inputenc}
\usepackage{amssymb,amsmath}
\input{include.tex}

\oddsidemargin -10mm
\evensidemargin -10mm
\textwidth 180mm
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\begin{document}
\input{titlepage.tex}
\input{ackno.tex}
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%\setcounter{page}{1}
\pagestyle{headings}

\tableofcontents
\chapter{Introduction and basic equations}
\section{Introduction}
\input{introduction.tex}
\input{notation.tex}
\input{basicequations.tex}

\chapter{Solution procedures}
\input{solutionprocedures.tex}
\chapter{Elements}
\chapter{Constitutive Equations}
\input{constitutiveequations.tex}
\chapter{Boundary conditions}

\phantomsection
\addcontentsline{toc}{chapter}{Bibliography}

\bibliographystyle{plain}
\bibliography{references}

\end{document}


